Move from PL2 to E3?

I currently have E-PL2, 25mm, 45mm, 14-42 Looking at E3 pricing ($489 on ebay) I am thinking whether I should reconfigure my kit to 4/3.

My thought, I can get E3, 12-60 and 50mm in similar price range (with mix of used/refurb items) that will offer me much better weather proof all around kit with "great" lenses at the cost of weight, size and possibly marginal degrade in sensor quality.